Cell, battery, and electric device

Abstract

A cell (10), a battery (100), and an electric device. The cell (10) comprises a casing (11), an electrode assembly (20), a first pole (12), and a second pole (13). A mounting cavity (11a) is formed inside the casing (11); a first mounting hole (11b) is formed at a first wall (11c) of the casing (11); and the first mounting hole (11b) runs through the first wall (11c). The electrode assembly (20) is at least partially located in the mounting cavity (11a). The first pole (12) is provided with a second mounting hole (12a) running through the first pole in a first direction; the first pole (12) is fixedly connected to the casing (11); and the first pole (12) is at least partially located outside the mounting cavity (11a). The second pole (13) is at least partially located in the second mounting hole (12a); and the second pole (13) is connected to, by means of welding, the part of the first pole (12) located outside the mounting cavity (11a), and is electrically connected to the first pole (12).

Description

Battery monomer, battery and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on the Chinese patent application No. 202410842202.4, filed on June 26, 2024, entitled "Battery monomer, battery and electric device", and claims the priority of the Chinese patent application No. 202410842202.4, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the technical field of battery, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0004] The battery monomer is provided with a pole, one end of the pole is located on the outer surface of the battery monomer, and the other end is located in the interior of the battery monomer to be electrically connected with an electrode assembly. The pole is used to lead current into or out of the battery monomer, so that the pole serves as a conduction medium of current to realize the charging and discharging function of the battery monomer.

[0005] In the related art, the pole and other devices in the battery monomer, such as a switching piece and a tab, are connected by welding. Since the welding position is located in the interior of the battery monomer, the welding slag and other foreign matters generated in the welding process are likely to remain in the interior of the battery monomer, thereby easily causing the risk of short circuit and other problems of the battery monomer.

[0006] SUMMARY

[0007] Therefore, embodiments of the present disclosure aim to provide a battery monomer, a battery and an electric device capable of reducing the risk of foreign matters generated in the welding process of the pole remaining in the interior of the battery monomer.

[0008] The technical solution of the embodiments of the present disclosure is implemented as follows:

[0009] Embodiments of the present disclosure provide a battery monomer, which comprises:

[0010] A housing is internally provided with a mounting cavity, a first wall of the housing is provided with a first mounting hole, and the first mounting hole penetrates through the first wall;

[0011] An electrode assembly is at least partially located in the mounting cavity;

[0012] A first pole is provided with a second mounting hole penetrating in a first direction, the first pole is fixedly connected to the housing, and at least a part of the first pole is located outside the mounting cavity;

[0013] The second pole post is at least partially located in the second mounting hole, and the second pole post is connected to the part of the first pole post outside the mounting cavity by a welding mark and is electrically connected to the first pole post.

[0014] In the battery cell in the embodiments of the present disclosure, the second pole post is arranged in the first pole post, so that the welding position is located on the outer surface of the battery cell, which is beneficial to welding after the battery cell is completely assembled and sealed and cleaning after the welding is completed, thereby reducing the probability of foreign matter entering the inside of the battery cell during the welding process, reducing the risk of short circuit of the electrode assembly caused by foreign matter, and improving the use safety of the battery cell.

[0015] In some embodiments, the battery cell further comprises a positioning assembly and a first insulating member, the first pole post and the positioning assembly are both located outside the shell, the positioning assembly is fixed to the shell, at least part of the first pole post and at least part of the first insulating member are both located between the positioning assembly and the shell, and the first pole post is located on the side of the first insulating member away from the shell. In this way, the size of the first mounting hole is reduced, the step of fixing the first pole post to the shell during the assembly of the battery cell is simplified, the position of the first pole post in the first direction is fixed by the positioning assembly and the first insulating member, and the shell and the first pole post are separated by the first insulating member to reduce the risk of short circuit caused by contact between the shell and the first pole post.

[0016] In some embodiments, the second pole post comprises a first sub-pole post and a second sub-pole post, the first sub-pole post is located on the side of the second sub-pole post close to the mounting cavity in the first direction, the first sub-pole post is made of a first conductive material, and the second sub-pole post is made of a second conductive material. In this way, the first sub-pole post and the second sub-pole post are made of different materials, on the one hand, the costs of different materials are different, and on the other hand, the manufacturing cost of the second pole post is reduced while meeting the conductive performance; on the other hand, the first sub-pole post and the bus member are made of the same material, so that the first sub-pole post and the bus member are welded.

[0017] In some embodiments, the combination position between the first sub-pole column and the second sub-pole column forms a combination area, and the battery monomer further comprises a first sealing member, which is annularly arranged on the surface of the second pole column on the side away from the first direction, at least part of the first sealing member is located between the first pole column and the second pole column and is sealingly attached to both, and the first sealing member covers the surface of the combination area, or the attachment position of the second pole column and the first sealing member is only located on the second sub-pole column. In this way, through the sealing effect of the first sealing member, the probability of damage to the second pole column caused by the electrochemical reaction between the first sub-pole column and the second sub-pole column due to the flow and penetration of the electrolyte in the battery monomer is reduced, the use safety of the battery monomer is improved, and the service life of the battery monomer is prolonged.

[0018] In some embodiments, the inner wall of the second mounting hole is provided with a first stop surface, the outer surface of the second sub-pole column is provided with a second stop surface, the second stop surface is located on the side away from the outside of the mounting cavity along the first direction, and in the projection plane perpendicular to the first direction, the projection of the first stop surface and the projection of the second stop surface at least partially overlap, and the first sealing member is clamped between the first stop surface and the second stop surface. In this way, it is beneficial to further increase the attachment area of the first sealing member and the second sub-pole column, the attachment area of the first sealing member and the first pole column by extruding the first sealing member, and to improve the sealing effect; by using the reaction force generated by the extrusion of the first sealing member, it is beneficial to keep the position between the first pole column and the second pole column stable along the first direction, and to reduce the probability of damage to the welding position of the first pole column and the second pole column.

[0019] In some embodiments, the first pole column is made of the first conductive material and is located outside the shell, and the battery monomer further comprises a second sealing member, which is arranged between the first pole column and the shell, the second sealing member is annularly arranged around the second pole column and is sealingly attached to the shell, and the second sealing member and the first sealing member are sealingly matched to isolate the first pole column and the first mounting hole. In this way, on the one hand, the second sealing member can reduce the probability of electrolyte leakage from the shell; on the other hand, the first sealing member and the second sealing member cooperate with each other, so that the electrolyte is difficult to contact the first sub-pole column and the first pole column through the attachment position, thereby reducing the probability of electrochemical reaction between the second sub-pole column and the first sub-pole column and the first pole column through the electrolyte, improving the use safety of the battery monomer, and prolonging the service life of the battery monomer.

[0020] In some embodiments, the first sealing member and the second sealing member are sealingly attached, so that the first sealing member and the second sealing member are independent of each other, which facilitates the use of a standard part in one of them, reduces manufacturing costs, and facilitates replacement of both.

[0021] Alternatively, the first sealing member and the second sealing member are of an integrated structure, which facilitates reducing the probability of contact with the first pole post through the first sealing member and the second sealing member, and simultaneously reduces the number of parts in the battery monomer and simplifies the assembly steps.

[0022] In some embodiments, the battery monomer further comprises a positioning assembly fixed to the shell, a portion of the positioning assembly is spaced apart from the second sealing member along the first direction, and a portion of the first pole post is clamped between the positioning assembly and the second sealing member along the first direction. In this way, the positioning of the first pole post in the first direction is achieved through the cooperation between the positioning assembly and the second sealing member.

[0023] In some embodiments, the first sealing member, the second sealing member, and the positioning assembly are of an integrated structure. In this way, it is further facilitated to reduce the probability of contact between the penetrated electrolyte and the first pole post, and to further reduce the number of parts in the battery monomer and simplify the assembly steps.

[0024] In some embodiments, the second sub-pole post is arranged in the first mounting hole, the battery monomer comprises a third sealing member sealingly attached between the inner wall of the first mounting hole and the second sub-pole post, and the bonding area is located on the side of the third sealing member away from the mounting cavity. In this way, through the sealing effect of the third sealing member, the probability of damage to the second pole post due to the electrochemical reaction between the first sub-pole post and the second sub-pole post caused by the flow and penetration of electrolyte in the battery monomer is reduced, the use safety of the battery monomer is improved, and the service life of the battery monomer is prolonged.

[0025] In some embodiments, the first pole post comprises a third sub-pole post and a fourth sub-pole post, the second mounting hole penetrates the third sub-pole post, the fourth sub-pole post is arranged on the side of the third sub-pole post away from the second mounting hole, the second pole post and the third sub-pole post are made of a first conductive material, and the fourth sub-pole post is made of a second conductive material. In this way, the third sub-pole post and the fourth sub-pole post are made of different materials, on the one hand, the costs of different materials are different, which facilitates reducing the manufacturing cost of the first pole post while meeting the conductive performance; on the other hand, the second pole post and the third sub-pole post are made of the same material as the busbar, so as to realize welding.

[0026] In some embodiments, the first pole post is located outside the shell, the battery cell further comprises a fourth sealing member, at least a portion of the fourth sealing member is located outside the shell and is arranged between the third sub-pole post and the shell to seal the third sub-pole post and the shell. In this way, the fourth sealing member prevents the electrolyte from leaking out through the joint between the third sub-pole post and the shell to cause an electrochemical reaction between the third sub-pole post and the fourth sub-pole post, thereby protecting the first pole post, prolonging the service life of the first pole post, and ensuring the safety of the battery cell.

[0027] In some embodiments, the third sub-pole post comprises a first sub-portion and a second sub-portion, the first sub-portion extends along a first direction and the second mounting hole is arranged on the first sub-portion, the second sub-portion is arranged at one end of the first sub-portion along the first direction and extends perpendicular to the first direction away from the second mounting hole, and the fourth sealing member is arranged between the second sub-portion and the shell. In this way, the second sub-portion extends perpendicular to the first direction, which helps to increase the contact area between the fourth sealing member and the second sub-portion, thereby improving the sealing effect.

[0028] In some embodiments, the fourth sub-pole post is provided with a second stop protrusion at one end thereof away from the second mounting hole along the first direction, the second stop protrusion is located on the side of the fourth sub-pole post close to the third sub-pole post, and a portion of the third sub-pole post is located on the side of the second stop protrusion close to the shell along the first direction to abut against the second stop protrusion along the first direction. In this way, the second stop protrusion inhibits the movement trend of the third sub-pole post and the fourth sub-pole post along the first direction, thereby improving the connection stability between the third sub-pole post and the fourth sub-pole post.

[0029] In some embodiments, the battery cell further comprises a bracket abutting between the second pole post and the electrode assembly. In this way, the bracket helps to position the second pole post and the electrode assembly along the first direction, and helps to keep the positions of the second pole post and the electrode assembly stable along the first direction, thereby reducing the probability of disconnection of the electrical connection due to changes in the relative positions of the second pole post and the electrode assembly caused by vibration or shaking of the battery cell.

[0030] In some embodiments, the battery cell further comprises a fastener for fastening the second pole post and the electrode assembly. In this way, the second pole post and the electrode assembly are not connected by welding, thereby avoiding the probability of short circuit between the second pole post and the electrode assembly caused by residual welding slag.

[0031] In some embodiments, an inner wall of the second mounting hole is provided with a first stop protrusion, and a portion of the second pole post is located on a side of the first stop protrusion away from the outside of the mounting cavity in the first direction, so as to be in stop cooperation with the second pole post in the first direction. In this way, by abutting between the first stop protrusion and the first pole post in the first direction, the movement tendency in the first direction between the two is inhibited, the welding area between the first pole post and the second pole post is reduced due to the force, and the probability of connection failure between the two is reduced, thereby improving the connection stability between the first pole post and the second pole post. The first stop protrusion can also play a positioning role, facilitating the determination of the position of the second pole post inserted into the second mounting hole, and providing convenience for subsequent welding of the first pole post and the second pole post.

[0032] In some embodiments, the size of the first stop protrusion in the first direction ranges from 0.5 mm to 2 mm.

[0033] In some embodiments, the size of the first stop protrusion perpendicular to the first direction ranges from 1 mm to 2 mm. In this way, on the one hand, the first stop protrusion can have sufficient structural strength to limit the first pole post; on the other hand, the size of the first stop protrusion is small, reducing the occupied space, and making the structure formed by the first pole post and the second pole post more compact.

[0034] In some embodiments, the first stop protrusion is in a ring structure to form an opening in communication between the second mounting hole and the outside of the mounting cavity. In this way, the end surface of the first pole post is flush with the end surface of the second pole post, facilitating welding of the two, and at the same time, the contact area between the first pole post and the second pole post is increased, which is beneficial to improve the current flow capacity and the sealing property between the two.

[0035] In some embodiments, the outer surface of the shell is formed with a protrusion protruding in the first direction, the first mounting hole is arranged on the protrusion, and a portion of the second pole post is located inside the protrusion. In this way, the space in the mounting cavity for arranging the electrode assembly is more regular, which is convenient for adapting to the outer contour of the electrode assembly and reducing the probability of interference between the electrode assembly and the second pole post.

[0036] The present disclosure also provides a battery including a current collector and the battery cell of any one of the foregoing embodiments, and at least one of the first pole post and the second pole post is electrically connected to the current collector. In this way, the current collector is used to connect each battery cell, so as to realize series and parallel connection between each battery cell.

[0037] The battery cell in the embodiments of the present disclosure is also used in a power supply of an electric device. Thus, by using the battery cell in the embodiments of the present disclosure, the adverse effects of foreign matters generated in the welding operation on the normal power supply of the electric device can be reduced, and the safety in use can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1 is a schematic view of an electric device being a vehicle in an embodiment of the present disclosure;

[0039] FIG. 2 is a schematic view of a battery in an embodiment of the present disclosure;

[0040] FIG. 3 is a schematic view of a battery cell in a first embodiment of the present disclosure;

[0041] FIG. 4 is a schematic view of a section along A-A in FIG. 3;

[0042] FIG. 5 is a schematic view of a partial enlargement of a section along B in FIG. 4;

[0043] FIG. 6 is a schematic view of a partial enlargement of a section along C in FIG. 5;

[0044] FIG. 7 is a schematic view of a partial enlargement of a section along C in a second embodiment of the present disclosure, the section being the same as that in FIG. 5;

[0045] FIG. 8 is a schematic view of a partial enlargement of a section along B in a third embodiment of the present disclosure, the section being the same as that in FIG. 4;

[0046] FIG. 9 is a schematic view of a partial enlargement of a section along B in a fourth embodiment of the present disclosure, the section being the same as that in FIG. 4;

[0047] FIG. 10 is a schematic view of a partial enlargement of a section along B in a fifth embodiment of the present disclosure, the section being the same as that in FIG. 4;

[0048] FIG. 11 is a schematic view of a partial enlargement of a section along D in FIG. 10;

[0049] FIG. 12 is a schematic view of an explosion of a battery cell in an embodiment of the present disclosure;

[0050] FIG. 13 is a schematic view of an arrangement of a battery cell and a current collector in an embodiment of the present disclosure.

[0051] REFERENCE SIGNS

[0052] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, battery cell; 11, shell; 111, protrusion; 112, end cap set; 113, housing; 11a, mounting cavity; 11b, first mounting hole; 11c, first wall; 11d, weld mark; 12, first pole post; 12a, second mounting hole; 12b, first stop face; 121, third sub-pole post; 1211, first sub-portion; 1212, second sub-portion; 122, fourth sub-pole post; 1221, second stop protrusion; 123, first stop protrusion; 13, second pole post; 13a, bonding region; 131, first sub-pole post; 132, second sub-pole post; 132a, second stop face; 14, first seal; 15, second seal; 16, positioning assembly; 161, second insulating member; 162, fixing member; 17, third seal; 18, fourth seal; 19, bracket; 191, first insulating member; 192, fastener; 20, electrode assembly; 30, busbar; 40, box body; 41, top cover; 42, bottom cover. DETAILED DESCRIPTION

[0053] It should be noted that the embodiments and technical features in the present disclosure can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the disclosure; the terms "comprising," "having," and any variations thereof in the present disclosure are intended to cover a non-exclusive inclusion.

[0055] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0056] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of the present disclosure, the term "and / or" is merely an association relationship of associated objects, and can represent three relationships, for example, A and / or B, which can represent three cases of A existing alone, A and B existing simultaneously, and B existing alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.

[0058] In the description of the embodiments of the present disclosure, for the convenience of description, as shown in FIG. 3 and FIG. 4, the direction in which the arrow X is located is the "first direction".

[0059] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0061] At present, batteries are more and more widely used in life and industry. Batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and in many fields such as aerospace. With the continuous expansion of the application field of batteries, the market demand is also increasing.

[0062] FIG. 2 is a perspective exploded view of the battery 100 provided by the embodiments of the present disclosure. As shown in FIG. 2, the battery 100 includes a box body 40 and at least one battery monomer 10,

[0063] The box body 40 includes a top cover 41 and a bottom cover 42, and the top cover 41 is covered above the bottom cover 42, so as to form an installation space for placing the battery monomer 10 between the bottom cover 42 and the top cover 41.

[0064] In the battery 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series or in parallel or in a mixed manner, and then the whole of the multiple battery cells 10 is placed in the accommodating space formed by the bottom cover 42 and the top cover 41. Of course, the battery 100 can also be in the form of a battery module in which the multiple battery cells 10 are connected in series or in parallel or in a mixed manner, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the accommodating space formed by the bottom cover 42 and the top cover 41. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing electrical connection between the multiple battery cells 10.

[0065] The battery cell 10 involved in the embodiments of the present disclosure includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer is laminated as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer protrudes from the current collector with the negative electrode active material layer, and the current collector without the negative electrode active material layer is laminated as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure.

[0066] The battery cell 10 can be a secondary battery, which means that the battery cell 10 can be activated by charging after discharging to continue to be used.

[0067] The battery cell 10 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0068] The battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shapes, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like, without specific limitation in the embodiments of the present disclosure.

[0069] The battery 100 involved in the embodiments of the present disclosure refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0070] The power consuming device involved in the embodiments of the present disclosure is powered by the battery described above, and the power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0071] In the following embodiments, for the convenience of description, the power consuming device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the drawings.

[0072] FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by an embodiment of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, and the like. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0073] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0074] The embodiments of the present disclosure are described in detail as follows.

[0075] In the related art, the battery cell includes an electrode assembly, a shell, and an end cover set, and a pole is arranged through the end cover set. In the process of assembling the battery cell, one end of the pole is connected with the electrode assembly by welding. Therefore, after the battery assembly is placed in the shell, the electrode assembly is welded with the pole, and then the end cover set is arranged on the shell to seal the battery cell.

[0076] Therefore, the part of the pole and the electrode assembly achieving electrical connection is also sealingly arranged inside the housing, and the welding area is also located inside the housing. During the welding operation, due to high temperature, the welding area will generate slag, clinker and other foreign matters, which may be sealed together with the welding area inside the housing. During the use of the battery monomer, due to the influence of external vibration, electrolyte flow and other factors, these foreign matters may adhere to other areas of the pole or the electrode assembly, thereby causing the risk of short circuit of the battery monomer.

[0077] The battery monomer provided by the embodiments of the present disclosure comprises a first pole and a second pole, the first pole is provided with a second mounting hole penetrating through the first pole, the first pole is arranged in the second mounting hole, and one end of the second mounting hole is arranged outside the housing of the battery monomer. Therefore, the first pole can be electrically connected with the electrode assembly in advance, then the second pole is arranged in the second mounting hole, and the first pole and the second pole are welded from the outside of the battery monomer, so that the foreign matters generated by welding are located outside the battery monomer and are difficult to enter the inside of the battery monomer.

[0078] Specifically, referring to FIGS. 3 to 5, the embodiments of the present disclosure provide a battery monomer 10 arranged in a battery 100, which comprises a housing 11, a first pole 12 and a second pole 13.

[0079] The housing 11 is internally formed with a mounting cavity 11a, and a first wall 11c of the housing 11 is provided with a first mounting hole 11b penetrating through the first wall 11c;

[0080] At least part of the electrode assembly 20 is located in the mounting cavity 11a.

[0081] The first pole 12 is provided with a second mounting hole 12a penetrating through the first pole 12 along a first direction, the first pole 12 is fixedly connected to the housing 11, and at least part of the first pole 12 is located outside the mounting cavity 11a;

[0082] At least part of the second pole 13 is located in the second mounting hole 12a, and the second pole 13 is connected to the part of the first pole 12 located outside the mounting cavity 11a by a welding mark and is electrically connected to the first pole 12.

[0083] The housing 11 forms the outer contour of the battery monomer 10 and provides a certain protection for other devices of the battery monomer 10 arranged in the mounting cavity 11a.

[0084] The first wall 11c refers to the physical structure of one of the outer surfaces forming the housing 11.

[0085] The mounting cavity 11a stores electrolyte, and an electrochemical reaction can occur between the electrode assembly 20 and the electrolyte.

[0086] At least part of the first pole 12 is located outside the mounting cavity 11a, that is, part or all of the first pole 12 is located outside the space of the mounting cavity 11a.

[0087] The second mounting hole 12a penetrates the first pole 12, so that the second mounting hole 12a communicates with the mounting cavity 11a. It can be that the first pole 12 is inserted into the mounting cavity 11a through the first mounting hole 11b, so that the second mounting hole 12a directly communicates with the mounting cavity 11a.

[0088] Since the second mounting hole 12a penetrates the first pole, one end of the second pole 13 can be electrically connected with the electrode assembly 20, and the other end is exposed outside the mounting cavity 11a through the side opening of the second mounting hole 12a.

[0089] The welding mark 11d refers to the molten area left by the welding of the first pole 12 and the second pole 13, that is, the first pole 12 and the second pole 13 are fixed by welding.

[0090] The welding mark 11d is located at the part of the first pole 12 located outside the mounting cavity 11a, that is, from the outside of the battery monomer 10, the part of the second pole 13 exposed outside and the first pole 12 can be welded, so that the first pole 12 and the second pole 13 are electrically connected.

[0091] The battery monomer 10 in the embodiment of the present disclosure is provided with the second pole 13 penetrating the first pole 12, so that the welding position can be located on the outer surface of the battery monomer 10, which is beneficial to the welding operation after the battery monomer 10 is completely assembled and sealed and the cleaning after the welding is completed, thereby reducing the probability of foreign matter entering the inside of the battery monomer 10 during the welding process, reducing the risk of short circuit of the electrode assembly 20 caused by foreign matter, and improving the use safety of the battery monomer 10.

[0092] In the production process of the battery monomer 10, after the first pole 12 is fixed with the shell 11 and the second pole 13 is connected with the electrode assembly 20, the second pole 13 is inserted into the second mounting hole 12a.

[0093] In some embodiments, part or all of the first pole 12 and the inner wall of the second mounting hole 12a are sealed and fitted, so as to reduce the probability of foreign matter entering the mounting cavity 11a through the joint between the first pole 12 and the second pole 13 after welding.

[0094] It can be understood that the welding between the first pole 12 and the second pole 13 is full welding, so as to reduce the probability of foreign matters entering the mounting cavity 11a through the joint between the first pole 12 and the second pole 13, and improve the sealing performance.

[0095] It can be understood that the battery cell 10 is provided with a positive electrode and a negative electrode.

[0096] In some embodiments, the number of the first poles 12 is at least two, and the number of the second poles 13 is at least two, wherein one first pole 12 and one second pole 13 form the positive electrode of the battery cell 10, and the other first pole 12 and the other second pole 13 form the negative electrode of the battery cell 10.

[0097] In some embodiments, referring to FIGS. 4 and 12, the shell 11 includes a housing 113 and an end cover set 112, the housing 113 is provided with a cavity, one side of the cavity is open, and the end cover set 112 can be arranged on the open position of the cavity to jointly form the mounting cavity 11a, and the first mounting hole 11b is located on the end cover set 112.

[0098] In some embodiments, referring to FIGS. 5 and 6, the first pole 12 is located outside the shell 11. That is, the first pole 12 does not extend into the first mounting hole 11b, and the second mounting hole 12a is in communication with one side opening of the first mounting hole 11b.

[0099] In this way, the size of the first mounting hole 11b is reduced, and the step of fixing the first pole 12 to the shell 11 during the assembly of the battery cell 10 is simplified.

[0100] It can be understood that the first pole 12 located outside the shell 11 needs to be fixed relative to the shell 11.

[0101] For example, referring to FIGS. 6, 7 and 11, the battery cell 10 further includes a positioning assembly 16 and a first insulating piece 191, the positioning assembly 16 is located outside the shell 11, the positioning assembly 16 is fixed to the shell 11, at least part of the first pole 12 and at least part of the first insulating piece 191 are located between the positioning assembly 16 and the shell 11, and the first pole 12 is located on the side of the first insulating piece 191 away from the shell 11.

[0102] The first insulating piece 191 is located between the first pole 12 and the shell 11 in the first direction, that is, the first pole 12 is separated from the shell 11 by the first insulating piece 191.

[0103] The positioning assembly 16 is fixed to the shell 11, and the first pole 12 and the first insulating piece 191 are clamped between the positioning assembly 16 and the shell 11, so that the positioning of the first pole 12 and the first insulating piece 191 in the first direction is realized.

[0104] It can be understood that the first pole 12 is made of conductive material, and the shell 11 is also made of metal material. If the shell 11 contacts the first pole 12 during the charging and discharging of the battery monomer 10, a short circuit between the two is likely to occur.

[0105] In this way, the position of the first pole 12 is fixed in the first direction by the positioning assembly 16 and the first insulating piece 191; the shell 11 and the first pole 12 are separated by the first insulating piece 191, reducing the risk of a short circuit between the two due to contact.

[0106] The specific arrangement position of the second pole 13 is not limited. The second pole 13 can be located outside the shell 11; the second pole 13 can be arranged to pass through the first mounting hole 11b; or the second pole 13 can extend into the mounting cavity 11a.

[0107] It can be understood that the first pole 12 and the second pole 13 are both made of conductive metal material.

[0108] In some embodiments, the material of the first pole 12 and the material of the second pole 13 are the same.

[0109] For example, the first pole 12 and the second pole 13 are both positive poles of the battery monomer 10, and the materials of the first pole 12 and the second pole 13 are both aluminum.

[0110] In some embodiments, the second pole 13 includes a first sub-pole 131 and a second sub-pole 132. The first sub-pole 131 is located on the side of the second sub-pole 132 close to the mounting cavity 11a in the first direction. The first sub-pole 131 is made of a first conductive material, and the second sub-pole 132 is made of a second conductive material.

[0111] In this way, the first sub-pole 131 and the second sub-pole 132 are made of different materials. On the one hand, different materials have different costs, and on the other hand, the use of different materials can reduce the manufacturing cost of the second pole 13 while meeting the conductive performance. On the other hand, it is beneficial to make the first sub-pole 131 and the current-carrying piece 30 made of the same material so that the two can be welded.

[0112] For example, the first conductive material is aluminum, the material of the current-carrying piece 30 is aluminum, and the second conductive material is copper.

[0113] It can be understood that since the second pole 13 is connected to the electrode assembly 20, the second pole 13 can contact the electrolyte. Since the materials of the first sub-pole 131 and the second sub-pole 132 are different, the first sub-pole 131 and the second sub-pole 132 can react electrochemically under the action of the electrolyte, causing damage to the second pole 13 and affecting its normal operation.

[0114] It is to be understood that a part of the surface of the first sub-pole 131 is directly exposed to the outside of the battery cell 10.

[0115] In some embodiments, referring to FIGS. 5 to 9, the joining position between the first sub-pole 131 and the second sub-pole 132 forms a joining region 13a, and the battery cell 10 further includes a first seal 14, which is annularly arranged on the surface of the second pole 13 on the side perpendicular to the first direction, at least a part of the first seal 14 is located between and sealingly attached to the first pole 12 and the second pole 13, and the first seal 14 covers the surface of the joining region 13a, or the attachment position of the second pole 13 and the first seal 14 is only located at the second sub-pole 132.

[0116] The joining region 13a refers to the joining interface between the first sub-pole 131 and the second sub-pole 132.

[0117] It is to be understood that, in the state where the electrolyte flows to the joining region 13a, the first sub-pole 131 and the second sub-pole 132 jointly electrochemically react with the electrolyte, causing the first sub-pole 131 and the second sub-pole 132 to be damaged.

[0118] The first seal 14 is sealingly attached to the first pole 12 and the second pole 13, respectively, so that the electrolyte is difficult to penetrate through the attachment surface between the first seal 14 and the first pole 12 and the attachment surface between the first seal 14 and the second pole 13.

[0119] Referring to FIG. 7, the first seal 14 covers the surface of the joining region 13a, that is, the edge of the joining region 13a extending to the surface of the second pole 13 on the side perpendicular to the first direction is completely located within the range of the attachment surface between the first seal 14 and the second pole 13. Due to the sealing effect of the first seal 14, the electrolyte is difficult to penetrate into the space between the first seal 14 and the second pole 13 and then contact the joining region 13a.

[0120] Referring to FIG. 6, the attachment position of the second pole 13 and the first seal 14 is only located at the second sub-pole 132, that is, the edge of the joining region 13a extending to the surface of the second pole 13 on the side perpendicular to the first direction is located on the side of the attachment surface between the first seal 14 and the first pole 12 away from the first mounting hole 11b. Due to the sealing effect of the first seal 14, the electrolyte is difficult to penetrate through the attachment surface between the first seal 14 and the second pole 13 and the attachment surface between the first seal 14 and the first pole 12, and then contact the joining region 13a.

[0121] Therefore, by the sealing effect of the first sealing member 14, the probability of the second pole 13 being damaged due to the electrochemical reaction between the first sub-pole 131 and the second sub-pole 132 caused by the flow and penetration of the electrolyte in the battery monomer 10 is reduced, the use safety of the battery monomer 10 is improved, and the service life of the battery monomer 10 is prolonged.

[0122] In some embodiments, referring to FIGS. 6 and 7, the inner wall of the second mounting hole 12a is provided with a first stop surface 12b, and the outer surface of the second sub-pole 132 is provided with a second stop surface 132a. The second stop surface 132a is located on the side of the first stop surface 12b away from the outside of the mounting cavity 11a along the first direction. In the projection plane perpendicular to the first direction, the projection of the first stop surface 12b and the projection of the second stop surface 132a at least partially overlap. The first sealing member 14 is clamped between the first stop surface 12b and the second stop surface 132a.

[0123] In the state that the battery monomer 10 expands, the current collector 30 generates an outward force, or the like, the second pole 13 has a movement trend of moving away from the shell 11, and further causes the first stop surface 12b and the second stop surface 132a to have a movement trend of moving close to each other. The first sealing member 14 located between the first stop surface 12b and the second stop surface 132a is subjected to the extrusion force of the second sub-pole 132 and the first pole 12.

[0124] Therefore, by extruding the first sealing member 14, the contact area of the first sealing member 14 with the second sub-pole 132 and the first pole 12 is further increased, the sealing effect is improved, the reaction force generated by the extrusion of the first sealing member 14 is utilized to stabilize the position of the first pole 12 and the second pole 13 along the first direction, and the probability of the welding position of the first pole 12 and the second pole 13 being damaged by force is reduced.

[0125] In some embodiments, the first stop surface 12b and the second stop surface 132a are both annularly arranged tapered surfaces.

[0126] It can be understood that the first sealing member 14 is made of an insulating material, such as rubber, silica gel, or the like.

[0127] The specific material of the first pole 12 is not limited. For example, the first pole 12 is made of a first conductive material, thereby facilitating the welding between the first pole 12 and the first sub-pole 131.

[0128] It can be understood that in the embodiment in which the first pole 12 is made of the first conductive material, the second sub-pole 132 has a risk of electrochemical reaction between the first poles 12 due to the penetration of the electrolyte.

[0129] In the embodiment in which the first pole 12 is made of the first conductive material and is located outside the shell 11, as shown in FIGS. 6-9, the battery monomer 10 further comprises a second sealing member 15, which is arranged between the first pole 12 and the shell 11, has a ring structure surrounding the second pole 13, and is sealingly attached to the shell 11. The second sealing member 15 and the first sealing member 14 are both sealingly fitted to isolate the first pole 12 from the first mounting hole 11b.

[0130] The first pole 12 is located outside the shell 11, so that the electrolyte in the mounting cavity 11a needs to pass through the first mounting hole 11b to contact the first pole 12, reducing the probability of contact between the electrolyte and the first pole 12.

[0131] The electrolyte seeping from the first mounting hole 11b is blocked by the sealingly attached position between the first sealing member 14 and the second pole 13 on the one hand, and by the sealingly attached position between the second sealing member 15 and the shell 11 on the other hand.

[0132] In this way, on the one hand, the second sealing member 15 can reduce the probability of electrolyte seeping from the shell 11; on the other hand, the first sealing member 14 and the second sealing member 15 cooperate with each other, making it difficult for the electrolyte to pass through the sealingly attached position to contact the first sub-pole 131 and the first pole 12, thereby reducing the probability of the second sub-pole 132 electrochemically reacting with the first sub-pole 131 and the first pole 12 through the electrolyte, respectively, improving the safety of use of the battery monomer 10, and helping to prolong the service life of the battery monomer 10.

[0133] It can be understood that the second sealing member 15 is located on the side of the first sealing member 14 that is perpendicular to the first direction and away from the second pole 13.

[0134] It can be understood that the second sealing member 15 is made of an insulating material, such as rubber, silicone, etc., so that the first pole 12 and the shell 11 are not electrically conductive.

[0135] The specific way in which the first sealing member 14 and the second sealing member 15 achieve sealing cooperation is not limited.

[0136] In some embodiments, referring to FIGS. 6 and 7, the first sealing member 14 and the second sealing member 15 are sealingly attached.

[0137] That is, the first sealing member 14 and the second sealing member 15 are independent parts that abut and attach to each other to play a sealing role, thereby reducing the probability of the electrolyte passing through the first sealing member 14 and the second sealing member 15 to contact the first pole 12.

[0138] In this way, the first seal 14 and the second seal 15 are independent of each other, which facilitates the adoption of a standard part in one of them, reduces manufacturing costs, and facilitates replacement of both.

[0139] The specific type of the standard part adopted in at least one of the first seal 14 and the second seal 15 is not limited, such as an O-ring.

[0140] In other embodiments, referring to FIG. 8, the first seal 14 and the second seal 15 are of an integrated structure. That is, the first seal 14 and the second seal 15 are different parts of one part.

[0141] In this way, it is facilitated to reduce the probability of contact with the first pole 12 through the first seal 14 and the second seal 15, and at the same time, it is facilitated to reduce the number of components in the battery monomer 10 and simplify the assembly steps.

[0142] The specific way of fixing the first pole 12 is not limited.

[0143] For example, referring to FIGS. 6-8, the battery monomer 10 further includes a positioning assembly 16 fixed to the shell 11, and a part of the positioning assembly 16 is spaced apart from the second seal 15 along the first direction, and a part of the first pole 12 is clamped between the positioning assembly 16 and the second seal 15 along the first direction.

[0144] That is, the two directions of the part of the first pole 12 along the first direction are respectively in abutting engagement with the positioning assembly 16 and the second seal 15.

[0145] In this way, through the cooperation between the positioning assembly 16 and the second seal 15, the fixation of the first pole 12 in the first direction is achieved.

[0146] It can be understood that in the embodiments provided with the second seal 15, the second seal 15 forms the first insulating part 191.

[0147] It can be understood that at least part of the positioning assembly 16 is made of an insulating material, such as rubber, silicone, engineering plastic, etc., so that the first pole 12 and the shell 11 are not electrically conductive.

[0148] The specific structure of the positioning assembly 16 is not limited.

[0149] Referring to FIGS. 6 and 7, the positioning assembly 16 includes a fixing member 162 and a second insulating member 161. A portion of the fixing member 162 is fixed to the housing 11, and another portion of the fixing member 162 is spaced apart from the housing 11 along the first direction to form a mounting cavity. The second insulating member 161 is clamped between the second pole 13 and the fixing member 162 perpendicularly to the first direction, so as to separate the second pole 13 and the fixing member 162. A portion of the second insulating member 161 is wrapped around one end of the fixing member 162.

[0150] The fixing member 162 is made of metal material, and is connected to the housing 11 by welding.

[0151] The second insulating member 161 separates the second pole 13 and the fixing member 162, so as to reduce the risk of short circuit caused by electrical conduction between the fixing member 162 and the second pole 13.

[0152] Referring to FIGS. 6 and 7, a portion of the first pole 12 is clamped between the second insulating member 161 and the second sealing member 15 along the first direction.

[0153] The specific process steps of fixing the positioning assembly 16 and the first pole 12 to the housing 11 are not limited.

[0154] For example, the first pole 12 and the fixing member 162 are placed in a mold, and a forming cavity is formed between the first pole 12 and the fixing member 162. The forming cavity is open at one end. Plastic is injected from the open end of the forming cavity. After the plastic solidifies, the second insulating member 161 is formed and the first pole 12 and the fixing member 162 are fixed to form a preform. The first insulating member 191 is placed on the housing 11. The preform is placed at a predetermined mounting position of the housing 11. The first pole 12 is in contact with the first insulating member 191 along the first direction. Then, the fixing member 162 is welded to the housing 11.

[0155] In some embodiments, referring to FIG. 9, the first sealing member 14, the second sealing member 15, and the positioning assembly 16 are integrated.

[0156] That is, the first sealing member 14, the second sealing member 15, and the positioning assembly 16 are different parts of the same part.

[0157] In this way, the probability of the penetrating electrolyte coming into contact with the first pole 12 is further reduced, and the number of components in the battery monomer 10 is further reduced, and the assembly steps are simplified.

[0158] In some embodiments, referring to FIGS. 5 to 9, the second pole 13 is arranged to pass through the first mounting hole 11b. In this way, on the one hand, the second sub-pole 132 can be connected to the electrode tab on the electrode assembly 20 with a smaller size. On the other hand, the second pole 13 can shield the first mounting hole 11b to some extent, so as to reduce the probability of the electrolyte overflowing through the first mounting hole 11b.

[0159] In the embodiment in which the second pole post 13 is inserted into the first mounting hole 11b, referring to FIG. 9, the battery cell 10 comprises a third sealing member 17, which is sealingly fitted between the inner wall of the first mounting hole 11b and the second pole post 13.

[0160] In this way, the third sealing member 17 can fill the space between the inner wall of the first mounting hole 11b and the second pole post 13, reducing the probability of electrolyte overflowing from the first mounting hole 11b in the mounting cavity 11a.

[0161] In some embodiments, referring to FIG. 9, the second pole post 13 is inserted into the first mounting hole 11b, and the third sealing member 17 is sandwiched between the inner wall of the first mounting hole 11b and the second pole post 13.

[0162] That is, the third sealing member 17 covers the surface of the bonding area 13a, or the bonding area 13a is located on the side of the third sealing member 17 away from the mounting cavity 11a.

[0163] The electrolyte is difficult to penetrate through the sealingly fitted surface between the third sealing member 17 and the second pole post 13 and the sealingly fitted surface between the third sealing member 17 and the housing 11.

[0164] In this way, through the sealing effect of the third sealing member 17, the probability of damage to the second pole post 13 due to the electrochemical reaction between the first pole post 131 and the second pole post 132 caused by the flow and penetration of electrolyte in the battery cell 10 is reduced, the use safety of the battery cell 10 is improved, and the service life of the battery cell 10 is prolonged.

[0165] It can be understood that the second pole post 13 and the inner wall of the first mounting hole 11b are in clearance fit, so that the second pole post 13 is inserted into the first mounting hole 11b.

[0166] It can be understood that the third sealing member 17 is made of an insulating material, such as rubber, silicone, etc., so that the second pole post 13 and the housing 11 are not electrically conductive.

[0167] In some embodiments provided with the first sealing member 14, the first sealing member 14 and the third sealing member 17 are in one-piece structure, so as to further improve the inhibition of electrolyte penetration and reduce the probability of electrochemical reaction between the first pole post 131 and the second pole post 132.

[0168] In some embodiments, referring to FIGS. 10 and 11, the first pole 12 includes a third sub-pole 121 and a fourth sub-pole 122, the second mounting hole 12a penetrates the third sub-pole 121, and the fourth sub-pole 122 is arranged on the side of the third sub-pole 121 away from the second mounting hole 12a. The second pole 13 and the third sub-pole 121 are made of the first conductive material, and the fourth sub-pole 122 is made of the second conductive material.

[0169] In this way, the third sub-pole 121 and the fourth sub-pole 122 are made of different materials. On the one hand, the different materials have different costs, and the use of the different materials can reduce the manufacturing cost of the first pole 12 while meeting the conductive performance. On the other hand, the second pole 13 and the third sub-pole 121 are made of the same material as the busbar 30, so that the second pole 13 and the third sub-pole 121 can be welded.

[0170] The third sub-pole 121 and the second pole 13 are connected by welding.

[0171] It can be understood that in the embodiments in which the first stop protrusion 123 is arranged on the third sub-pole 121.

[0172] It can be understood that, since the material of the third sub-pole 121 is different from the material of the fourth sub-pole 122, if the electrolyte is deposited on the positions where the third sub-pole 121 and the fourth sub-pole 122 are combined with each other, an electrochemical reaction will occur between the third sub-pole 121 and the fourth sub-pole 122, which will further cause the corrosion and damage of the first pole 12.

[0173] In some embodiments, referring to FIGS. 10 and 11, the first pole 12 is located outside the shell 11, and the battery monomer 10 includes a fourth sealing member 18. At least part of the fourth sealing member 18 is located outside the shell 11 and arranged between the third sub-pole 121 and the shell 11 to seal the third sub-pole 121 and the shell 11.

[0174] It can be understood that, since the fourth sub-pole 122 is located on the side of the third sub-pole 121 away from the second mounting hole 12a, the electrolyte needs to at least pass through the joint between the third sub-pole 121 and the second pole 13 or the joint between the third sub-pole 121 and the shell 11 to be in contact with the third sub-pole 121 and the fourth sub-pole 122. The joint between the third sub-pole 121 and the second pole 13 can be sealed by welding, and the joint between the third sub-pole 121 and the shell 11 is sealed by the fourth sealing member 18.

[0175] Thus, the electrolyte is difficult to seep through the joint between the third sub-pole 121 and the shell 11, and the fourth sub-pole 122 and the shell 11, and thus the electrochemical reaction between the third sub-pole 121 and the fourth sub-pole 122 is prevented, thereby protecting the first pole 12 and prolonging the service life of the first pole 12 and the use safety of the battery cell 10.

[0176] In some embodiments, the second pole 13 is arranged in the first mounting hole 11b, and a part of the fourth seal 18 is arranged between the inner wall of the first mounting hole 11b and the second pole 13 and is sealed and fitted with both. Thus, the inhibitory effect of the fourth seal 18 on the seepage of the electrolyte is further improved.

[0177] In some embodiments, referring to the drawings, the third sub-pole 121 includes a first sub-portion 1211 and a second sub-portion 1212. The first sub-portion 1211 extends along the first direction, and the second mounting hole 12a is arranged in the first sub-portion 1211. The second sub-portion 1212 is arranged at one end of the first sub-portion 1211 along the first direction and extends perpendicular to the first direction in a direction away from the second mounting hole 12a. The fourth seal 18 is arranged between the second sub-portion 1212 and the shell 11.

[0178] That is, the second sub-portion 1212 is located at one end of the first sub-portion 1211 along the first direction close to the shell 11.

[0179] Thus, by extending the second sub-portion 1212 perpendicular to the first direction, the contact area between the fourth seal 18 and the second sub-portion 1212 is increased, and the sealing effect is improved.

[0180] In some embodiments provided with the positioning assembly 16, referring to FIG. 11, at least a part of the second sub-portion 1212 is located between a part of the positioning assembly 16 and the fourth seal 18 along the first direction, so as to limit the position of the third sub-pole 121 along the first direction.

[0181] In some embodiments, referring to FIG. 11, a part of the fourth sub-pole 122 is arranged between the second sub-portion 1212 and the second insulating member 161 along the first direction, so as to fix the fourth sub-pole 122 along the first direction.

[0182] In some embodiments, referring to FIG. 11, the positioning assembly 16 is sealed and fitted with the fourth seal 18 and forms a stop space. The stop space is open on the side perpendicular to the first direction and facing the first pole 12. A part of the third sub-pole 121 and the second sub-portion 1212 are stacked along the first direction and inserted into the stop space through the open part of the stop space, so as to be fitted with the inner wall of the stop space.

[0183] Thus, while achieving the positioning of the third sub-pole 121 and the fourth sub-pole 122, better sealing effect is further achieved through the sealing cooperation of the positioning assembly 16 and the fourth sealing member 18, reducing the probability of the electrolyte contacting the third sub-pole 121 and the fourth sub-pole 122 at the same time.

[0184] It can be understood that, in the embodiment provided with the fourth sealing member 18, the fourth sealing member 18 forms the first insulation member 191.

[0185] In some embodiments, referring to FIG. 11, the fourth sub-pole 122 is provided with a second stop protrusion 1221 at one end thereof away from the second mounting hole 12a along the first direction, and the second stop protrusion 1221 is located at a side of the fourth sub-pole 122 close to the third sub-pole 121, and a part of the third sub-pole 121 is located at a side of the second stop protrusion 1221 close to the shell 11 along the first direction to abut against the second stop protrusion 1221 along the first direction.

[0186] Thus, the second stop protrusion 1221 inhibits the moving trend of the third sub-pole 121 and the fourth sub-pole 122 along the first direction, which is conducive to improving the connection stability between the third sub-pole 121 and the fourth sub-pole 122.

[0187] In some embodiments, the third sub-pole 121 and the fourth sub-pole 122 are two independent parts, and the two are electrically connected only through the abutting contact, and the positioning of the third sub-pole 121 and the fourth sub-pole 122 is achieved only through the positioning assembly 16, the fourth sealing member 18 and the second pole 13, without additional connection forms, which is conducive to improving the electrical conductivity between the first sub-pole 131 and the second sub-pole 132.

[0188] Referring to FIGS. 6 and 7, a part of the third sub-pole 121 and a part of the fourth sub-pole 122 are clamped between the second insulation member 161 and the second sealing member 15 along the first direction.

[0189] The specific way of fixing the second pole 13 and the electrode assembly 20 is not limited.

[0190] For example, referring to FIG. 5, the battery monomer 10 further comprises a fastener 192 for fastening the second pole 13 and the electrode assembly 20.

[0191] Thus, the second pole 13 and the electrode assembly 20 are not connected through welding, avoiding the probability of short circuit connection between the second pole 13 and the electrode assembly 20 caused by residual welding slag.

[0192] The specific type of fastener 192 is not limited, and the fastener 192 is a rivet, for example, and the second pole 13 and the electrode assembly 20 are each provided with a riveting hole, and the fastener 192 passes through the riveting holes of both to fix the second pole 13 and the electrode assembly 20 by riveting.

[0193] It can be understood that a plurality of battery monomers 10 are provided in the battery 100, and each battery monomer 10 is electrically connected by busbars. The busbar 30 is used to connect at least one of the first pole 12 or the second pole 13 to achieve electrical connection.

[0194] During the operation of the battery monomer 10, the battery monomer 10 expands due to factors such as temperature rise, and at the same time, the busbar 30 pulls the second pole 13 outward in the case of electrical connection with the second pole 13, thereby causing a tendency of relative movement between the first pole 12 and the second pole 13.

[0195] In some embodiments, referring to FIG. 5, the inner wall of the second mounting hole 12a is provided with a first stop protrusion 123, and a portion of the second pole 13 is located on the side of the first stop protrusion 123 away from the outside of the mounting cavity 11a in the first direction, so as to stop and cooperate with the second pole 13 in the first direction.

[0196] In this way, by abutting between the first stop protrusion 123 and the first pole 12 in the first direction, the tendency of movement between the two in the first direction is inhibited, the damage of the welding area between the first pole 12 and the second pole 13 due to stress is reduced, thereby reducing the probability of failure of the connection between the two, and the connection stability between the first pole 12 and the second pole 13 is improved; the first stop protrusion 123 can also play a positioning role, facilitating the determination of the position of the second pole 13 inserted into the second mounting hole 12a, and providing convenience for subsequent welding of the first pole 12 and the second pole 13.

[0197] In some embodiments, referring to FIG. 5, the size of the first stop protrusion 123 in the first direction ranges from 0.5 mm to 2 mm. That is, 0.5 mm≤L1≤2 mm.

[0198] In this way, on the one hand, the first stop protrusion 123 can have sufficient structural strength to limit the first pole 12; on the other hand, the size of the first stop protrusion 123 is small, reducing the occupied space, and making the structure formed by the first pole 12 and the second pole 13 more compact.

[0199] The specific value of the first stop protrusion 123 in the first direction is not limited, for example, 0.5 mm, 0.75 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, etc.

[0200] The specific manner of measuring the size of the first stop protrusion 123 along the first direction is not limited, for example, in the case where the room temperature is 25 degrees Celsius, the two ends of the first pole 12 along the first direction are measured by the main scale jaw and the vernier jaw of the vernier caliper, the data displayed by the vernier caliper is read, and the first size is obtained; one end of the vernier caliper provided with a depth scale is abutted against the end face where the side opening of the second mounting hole 12a is located, the depth scale is inserted into the second mounting hole 12a from the opening of the second mounting hole 12a until it abuts against one end of the first stop protrusion 123 along the first direction, the data displayed by the vernier caliper is read, and the second size is obtained; one end of the vernier caliper provided with a depth scale is abutted against the end face where the second end of the second mounting hole 12a is located, the depth scale is inserted into the second mounting hole 12a from the second end of the second mounting hole 12a until it abuts against the other end of the first stop protrusion 123 along the first direction, the data displayed by the vernier caliper is read, and the third size is obtained, the sum of the second size and the third size is subtracted by the first size, and the size of the first stop protrusion 123 along the first direction is obtained.

[0201] In some embodiments, referring to FIG. 5, the size of the first stop protrusion 123 perpendicular to the first direction ranges from 1 mm to 2 mm. That is, 1 mm≤L2≤2 mm.

[0202] In this way, on the one hand, the first stop protrusion 123 can have sufficient structural strength to limit the first pole 12; on the other hand, the size of the first stop protrusion 123 is small, which reduces the occupied space and makes the structure formed by the first pole 12 and the second pole 13 more compact.

[0203] The specific value of the first stop protrusion 123 perpendicular to the first direction is not limited, for example, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, etc.

[0204] The specific manner of measuring the size of the first stop protrusion 123 perpendicular to the first direction is not limited, for example, in the case where the room temperature is 25 degrees Celsius, the two jaws of the inside micrometer perpendicular to the first direction are abutted against the inner walls of the opposite two ends of the first mounting hole 11b, the data of the inside micrometer is read, and the fourth size is obtained; one jaw of the inside micrometer is abutted against the end of the first stop protrusion 123 perpendicular to the first direction, and the other jaw is abutted against the inner wall of the first mounting hole 11b perpendicular to the first direction, the data of the inside micrometer is read, and the fifth size is obtained, and the difference between the fourth size and the fifth size is the size of the first stop protrusion 123 perpendicular to the first direction.

[0205] The specific shape of the first stop protrusion 123 is not limited, for example, the number of the first stop protrusions 123 is multiple, and the multiple first stop protrusions 123 are arranged around the first direction as an axis; or for example, the first stop protrusion 123 is a ring structure, and the first stop protrusion 123 is arranged in a ring around the first direction as an axis.

[0206] In some embodiments, referring to FIG. 5, the first stop protrusion 123 is a ring structure, and the first stop protrusion 123 forms an opening in communication with the outside of the second mounting hole 12a and the mounting cavity 11a. That is, the first stop protrusion 123 is located at the edge of one end of the second mounting hole 12a.

[0207] In this way, it is beneficial to make the end surface of the first pole column 12 flush with the end surface of the second pole column 13, facilitate welding between the two, and at the same time, it is beneficial to increase the contact area between the first pole column 12 and the second pole column 13, and improve the current flow capacity and the sealing performance between the two.

[0208] In some embodiments, referring to FIG. 4 and FIG. 5, the battery monomer 10 further comprises a bracket 19, and the bracket 19 abuts between the second pole column 13 and the electrode assembly 20.

[0209] In this way, the bracket 19 is beneficial to realize the positioning of the second pole column 13 and the electrode assembly 20 along the first direction, and beneficial to keep the positions of the two stable along the first direction, thereby reducing the probability of disconnection of the electrical connection due to the change of the relative positions of the second pole column 13 and the electrode assembly 20 caused by the factors such as vibration and shaking of the battery monomer 10.

[0210] In the embodiments provided with the first stop protrusion 123, the first sub-pole column 131 and the second sub-pole column 132, the first sub-pole column 131 and the second sub-pole column 132 are directly positioned along the first direction by abutting contact, that is, the first sub-pole column 131 and the second sub-pole column 132 can be two different parts, and the first stop protrusion 123 and the bracket 19 directly apply different directional forces to the two along the first direction to fix the first sub-pole column 131 and the second sub-pole column 132, so that no additional connection form is needed, and the electrical conductivity between the first sub-pole column 131 and the second sub-pole column 132 is improved.

[0211] In some embodiments, referring to FIG. 4 and FIG. 5, the outer surface of the shell 11 is formed with a protrusion 111 protruding along the first direction, the first mounting hole 11b is arranged on the protrusion 111, and a part of the second pole column 13 is located inside the protrusion 111.

[0212] That is, the protrusion 111 is a hollow structure, and the space inside the protrusion 111 is also part of the mounting cavity 11a.

[0213] In this way, the space in the mounting cavity 11a for arranging the electrode assembly 20 is more regular, which is convenient for adapting to the outer contour of the electrode assembly 20 and reducing the probability of interference between the electrode assembly 20 and the second pole 13.

[0214] It can be understood that, referring to FIG. 4, the protrusion 111 is arranged on the first wall 11c.

[0215] In a specific embodiment of the embodiments of the present disclosure, the battery cell 10 is described as follows:

[0216] The battery cell 10 comprises a housing 11, an electrode assembly 20, a first pole 12, a second pole 13, a first seal 14, a second seal 15, a third seal 17, a positioning assembly 16 and a bracket 19, the housing 11 has an installation cavity 11a inside, a first wall 11c of the housing 11 is formed with a protrusion 111 protruding in a first direction, a first installation hole 11b is formed through the first wall 11c to communicate the outside of the housing 11 with the installation cavity 11a, the first installation hole 11b is fixedly connected to the protrusion 111, the electrode assembly 20 is located in the installation cavity 11a, the first pole 12 is provided with a second installation hole 12a penetrating in the first direction, at least a part of the first pole 12 is located outside the installation cavity 11a, a second sub-pole 132 of the first pole 12 is arranged in the first installation hole 11b, the positioning assembly 16 is fixed to the housing 11, at least a part of the first pole 12 and at least a part of the second seal 15 are located between the positioning assembly 16 and the housing 11 in the first direction, the first pole 12 is located on a side of the second seal 15 away from the housing 11, at least a part of the second pole 13 is located in the second installation hole 12a and a part of the second pole 13 is located inside the protrusion 111, the second pole 13 is connected to the part of the first pole 12 outside the installation cavity 11a through a welding mark 11d and is electrically connected to the first pole 12, the second pole 13 is electrically connected to the electrode assembly 20, an inner wall of the second installation hole 12a is provided with a first stop protrusion 123, a part of the second pole 13 is located on a side of the first stop protrusion 123 away from the outside of the installation cavity 11a in the first direction to stop cooperation with the second pole 13 in the first direction.The first stop protrusion 123 has a size ranging from 0.5 mm to 2 mm along the first direction, a size ranging from 1 mm to 2 mm perpendicular to the first direction, and a ring structure to form an opening for the second mounting hole 12a to communicate with the outside of the mounting cavity 11a. The second pole 13 includes a first sub-pole 131 and a second sub-pole 132. The first sub-pole 131 is located on the side of the second sub-pole 132 close to the outside of the mounting cavity 11a along the first direction. The first sub-pole 131 is made of the first conductive material, and the second sub-pole 132 is made of the second conductive material. The combination position between the first sub-pole 131 and the second sub-pole 132 forms a combination area 13a. The first seal 14 is annularly arranged on the surface of the second pole 13 perpendicular to the first direction. At least part of the first seal 14 is located between and sealingly attached to the first pole 12 and the second pole 13. The attachment position of the second pole 13 and the first seal 14 is only located on the second sub-pole 132. The inner wall of the second mounting hole 12a is provided with a first stop surface 12b, and the outer surface of the second sub-pole 132 is provided with a second stop surface 132a. The second stop surface 132a is located on the side of the first stop surface 12b away from the outside of the mounting cavity 11a along the first direction. In the projection plane perpendicular to the first direction, the projection of the first stop surface 12b and the projection of the second stop surface 132a at least partially overlap. The first seal 14 is clamped between the first stop surface 12b and the second stop surface 132a. The first pole 12 is made of the first conductive material and is located outside the housing 11. The second seal 15 is arranged between the first pole 12 and the housing 11. The second seal 15 is annularly arranged around the second pole 13 and sealingly attached to the housing 11. The second seal 15 and the first seal 14 are sealingly attached to each other to isolate the first pole 12 and the first mounting hole 11b. The combination area 13a is located on the side of the third seal 17 away from the mounting cavity 11a. The bracket 19 is abutted between the second pole 13 and the electrode assembly 20.

[0217] The battery 100 includes the busbar 30 and the battery cell 10 of any one of the foregoing embodiments. At least one of the first pole 12 and the second pole 13 is electrically connected to the busbar 30.

[0218] In this way, the battery cells 10 are connected by the busbar 30 to realize series and parallel connection between the battery cells 10.

[0219] The busbar 30 can be electrically connected to only the first pole 12, only the second pole 13, or both the first pole 12 and the second pole 13.

[0220] The specific manner in which at least one of the first pole post 12 and the second pole post 13 is connected with the busbar 30 is not limited, for example, welding.

[0221] The embodiments of the present disclosure also provide a power-using device, which comprises the battery 100 in the foregoing embodiments, and the battery 100 serves as a power supply of the power-using device.

[0222] In this way, by adopting the battery monomer 10 in the embodiments of the present disclosure, it is favorable to reduce the adverse effects of the foreign matter generated by the welding operation on the normal power supply of the power-using device, and it is favorable to improve the use safety.

[0223] The various embodiments / implementation manners provided by the present disclosure can be combined with each other without contradiction.

[0224] The above merely describes the preferred embodiments of the present disclosure and is not intended to limit the embodiments of the present disclosure. The embodiments of the present disclosure can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure shall be included in the protection scope of the embodiments of the present disclosure.

Claims

1. A battery cell, the battery cell comprising: The outer shell has an internal mounting cavity, and a first mounting hole is provided on the first wall of the outer shell, the first mounting hole penetrating the first wall; The electrode assembly is at least partially located within the mounting cavity; The first pole post has a second mounting hole that extends through a first direction. The first pole post is fixedly connected to the outer shell, and at least a portion of the first pole post is located outside the mounting cavity. The second pole is at least partially located within the second mounting hole. The second pole is connected to the portion of the first pole located outside the mounting cavity by soldering and is electrically connected to the first pole.

2. The battery cell of claim 1, wherein, The battery cell further includes a positioning component and a first insulating component. The first terminal post and the positioning component are both located outside the housing. The positioning component is fixed to the housing. At least a portion of the first terminal post and at least a portion of the first insulating component are located between the positioning component and the housing. The first terminal post is located on the side of the first insulating component facing away from the housing.

3. The battery cell of claim 1, wherein, The second electrode post includes a first sub-electrode post and a second sub-electrode post. The first sub-electrode post is located on the side of the second sub-electrode post close to the mounting cavity along the first direction. The first sub-electrode post is made of a first conductive material, and the second sub-electrode post is made of a second conductive material.

4. The battery cell according to claim 3, wherein, The junction between the first sub-terminal and the second sub-terminal forms a junction area. The battery cell also includes a first sealing member. The first sealing member is arranged around the surface of the second terminal on the side perpendicular to the first direction. At least a portion of the first sealing member is located between the first terminal and the second terminal and is sealed and fitted to both. The first sealing member covers the surface of the junction area. Alternatively, the junction between the second terminal and the first sealing member is located only on the second sub-terminal.

5. The battery cell according to claim 4, wherein, The inner wall of the second mounting hole is provided with a first stop surface, and the outer surface of the second sub-pole post is provided with a second stop surface. The second stop surface is located on the side of the first stop surface away from the outside of the mounting cavity along the first direction. In a projection plane perpendicular to the first direction, the projection of the first stop surface and the projection of the second stop surface at least partially overlap. The first sealing member is sandwiched between the first stop surface and the second stop surface.

6. The battery cell according to claim 4 or 5, wherein, The first electrode post is made of the first conductive material and is located outside the housing. The battery cell also includes a second sealing member. The second sealing member is disposed between the first electrode post and the housing. The second sealing member is an annular structure surrounding the second electrode post and is sealed and fitted to the housing. The second sealing member and the first sealing member are sealed together to isolate the first electrode post from the first mounting hole.

7. The battery cell according to claim 6, wherein, The first seal and the second seal are sealed together. Alternatively, the first seal and the second seal may be an integral structure.

8. The battery cell according to claim 6 or 7, wherein, The battery cell also includes a positioning component, which is fixed to the housing. A portion of the positioning component is spaced apart from the second seal along the first direction, and a portion of the first electrode post is sandwiched between the positioning component and the second seal along the first direction.

9. The battery cell according to claim 8, wherein, The first seal, the second seal, and the positioning assembly are an integral structure.

10. The battery cell according to any one of claims 4 to 9, wherein, The second sub-terminal is inserted into the first mounting hole. The battery cell includes a third sealing element, which is sealed and fitted between the inner wall of the first mounting hole and the second sub-terminal. The bonding area is located on the side of the third sealing element away from the mounting cavity.

11. The battery cell according to any one of claims 1 to 10, wherein, The first electrode post includes a third sub-electrode post and a fourth sub-electrode post. The second mounting hole penetrates the third sub-electrode post, and the fourth sub-electrode post is located on the side of the third sub-electrode post opposite to the second mounting hole. The second electrode post and the third sub-electrode post are both made of a first conductive material, and the fourth sub-electrode post is made of a second conductive material.

12. The battery cell according to claim 11, wherein, The first terminal is located outside the housing, and the battery cell includes a fourth seal, at least a portion of which is located outside the housing and disposed between the third terminal and the housing for a sealing fit.

13. The battery cell according to claim 12, wherein, The third sub-pole post includes a first sub-part and a second sub-part. The first sub-part extends along a first direction and the second mounting hole is provided in the first sub-part. The second sub-part is provided at one end of the first sub-part along the first direction and extends perpendicular to the first direction away from the second mounting hole. The fourth sealing member is sandwiched between the second sub-part and the outer shell.

14. The battery cell according to claim 12 or 13, wherein, The fourth sub-terminal has a second stop protrusion at one end away from the second mounting hole along the first direction. The second stop protrusion is located on the side of the fourth sub-terminal close to the third sub-terminal. A portion of the third sub-terminal is located on the side of the second stop protrusion close to the outer casing along the first direction, so as to abut against the second stop protrusion along the first direction.

15. The battery cell according to any one of claims 1 to 14, wherein, The battery cell also includes fasteners for securing the second terminal post to the electrode assembly.

16. The battery cell according to any one of claims 1 to 15, wherein, The inner wall of the second mounting hole is provided with a first stop protrusion, and a portion of the second pole post is located on the side of the first stop protrusion away from the outside of the mounting cavity along the first direction, so as to cooperate with the second pole post in a stop-fitting manner along the first direction.

17. The battery cell according to claim 16, wherein, The size of the first stop protrusion along the first direction ranges from 0.5 mm to 2 mm; And / or, the size of the first stop protrusion perpendicular to the first direction ranges from 1 mm to 2 mm.

18. The battery cell according to claim 16 or 17, wherein, The first stop protrusion is an annular structure to enclose an opening that connects the second mounting hole to the outside of the mounting cavity.

19. The battery cell according to claim 1, wherein, The outer surface of the housing has a protrusion protruding along the first direction, the first mounting hole is provided on the protrusion, and a portion of the second pole post is located inside the protrusion.

20. A battery comprising a busbar and a battery cell of any one of claims 1-19, wherein at least one of the first terminal and the second terminal is electrically connected to the busbar.

21. An electrical device comprising the battery of claim 20, wherein the battery serves as a power source for the electrical device.

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